auto 29 April 2026 Daily Monitor (Uganda)
Car Engine Jerks After Switch-Off: Common Causes and Fixes
A slight jerk or shudder when turning off your car engine often signals 'engine run on,' caused by worn engine mounts, faulty fuel injectors, or carbon deposits in the intake manifold. Addressing these issues promptly prevents long-term damage to the engine and emissions systems. Source: https://www.monitor.co.ug/uganda/business/auto/why-does-my-engine-jerk-even-after-i-switch-it-off--5441206
Many drivers notice their car engine giving a slight jerk or shudder right after switching it off. This phenomenon, known as ‘engine run on,’ points to underlying mechanical or ignition problems in modern fuel-powered vehicles.
One primary culprit is deteriorated engine mounts. These components, featuring rubber bushes on metal brackets, absorb vibrations during operation and shutdown. When the rubber wears out, it fails to dampen the engine’s final shakes, transmitting jolts to the chassis and body.
Fuel system issues, particularly leaking injectors, can also trigger this. Normally, injectors release fuel only under electronic control from the engine management system. Damaged injectors, clogged with carbon or mechanically faulty, drip fuel into cylinders post-shutdown, sparking unwanted combustion and jerks.
Carbon buildup in the intake manifold worsens matters. It forms patches that absorb fuel, creating hot spots which ignite air-fuel mixtures unexpectedly, even as the crankshaft slows to a halt.
Though not impacting daily driving, ignoring these signs risks expensive engine and emissions damage over time. Visit a mechanic soon for inspection and repair.
Source: Daily Monitor (Uganda)